Hello everybody!
There have been multiple reports on the Internet of a bug affecting Android 4.4 that causes Exchange ActiveSync accounts to get stuck in a loop after the first sync.
Additional informations are available at:
https://productforums.google.com/forum/#!msg/nexus/PMOplIFLGAk/4GpCX-KHrA4J (official Nexus product forums)
https://code.google.com/p/android/issues/detail?can=2&start=0&num=100&q=corporate&colspec=ID%20Type%20Status%20Owner%20Summary%20Stars&groupby=&sort=&id=61785 (official Android issue tracker)
We are still investigating the issue and cannot confirm whether it's an issue only related to Nexus5 devices or if it will affect other devices. While we keep on testing, feel free to share your Android 4.4 experiences here!
Have a nice day,
Cine
the ZeXtras Team